Gigabyte GA-Z77X-UD5H Code: 15 then 51

I have a Gigabyte GA-Z77X-UD5H motherboard. This is an ongoing problem. I've swapped everything on it. I've sent in the motherboard and received a brand new one... Same thing. The code on the board displays 15, then quickly changes to 51. It sits on that for a few seconds, beeps one time; immediately shutting off. Help!

UPDATE** I can get into BIOS with 1 stick in slot 4 ONLY.

UPDATE**** When I run Windows Repair it beeps and freezes the loading bar immediately. Do you guys think I've got a bad hard drive?

NOTE: When I bought this computer it worked for about 3 months with 1 stick in it without issues. It started beeping and shutting off. I sent in the motherboard for replacement and bought another stick (exact same brand, model, size memory stick).
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More about gigabyte z77x ud5h code
  1. Sounds like it could be memory incompatibility. If you have any other memory try that and also remove all but one memory stick and boot like that.....also refer to your manual to see what codes are because I'm not familiar with GA MB.
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